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vf_setpts: switch to an AVOptions-based system.

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This commit is contained in:
Anton Khirnov 2013-02-25 21:21:29 +01:00
parent 95f1f56a21
commit 33b97faaba
2 changed files with 33 additions and 6 deletions
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17
doc/filters.texi
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@ -1895,8 +1895,17 @@ See also the @ref{setsar} filter documentation.
Change the PTS (presentation timestamp) of the input video frames.
Accept in input an expression evaluated through the eval API, which
can contain the following constants:
This filter accepts the following options:
@table @option
@item expr
The expression which is evaluated for each frame to construct its timestamp.
@end table
The expression is evaluated through the eval API and can contain the following
constants:
@table @option
@item PTS
@ -1938,10 +1947,10 @@ Some examples follow:
@example
# start counting PTS from zero
setpts=PTS-STARTPTS
setpts=expr=PTS-STARTPTS
# fast motion
setpts=0.5*PTS
setpts=expr=0.5*PTS
# slow motion
setpts=2.0*PTS

22
libavfilter/vf_setpts.c
View File

@ -29,6 +29,7 @@
#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "avfilter.h"
#include "internal.h"
@ -67,6 +68,8 @@ enum var_name {
};
typedef struct {
const AVClass *class;
char *expr_str;
AVExpr *expr;
double var_values[VAR_VARS_NB];
} SetPTSContext;
@ -76,9 +79,9 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
SetPTSContext *setpts = ctx->priv;
int ret;
if ((ret = av_expr_parse(&setpts->expr, args ? args : "PTS",
if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
return ret;
}
@ -145,6 +148,20 @@ static av_cold void uninit(AVFilterContext *ctx)
setpts->expr = NULL;
}
#define OFFSET(x) offsetof(SetPTSContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
{ NULL },
};
static const AVClass setpts_class = {
.class_name = "setpts",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVFilterPad avfilter_vf_setpts_inputs[] = {
{
.name = "default",
@ -171,6 +188,7 @@ AVFilter avfilter_vf_setpts = {
.uninit = uninit,
.priv_size = sizeof(SetPTSContext),
.priv_class = &setpts_class,
.inputs = avfilter_vf_setpts_inputs,
.outputs = avfilter_vf_setpts_outputs,